21652743945 has 64 divisors (see below), whose sum is σ = 40150056960. Its totient is φ = 9760117248.

The previous prime is 21652743911. The next prime is 21652743949. The reversal of 21652743945 is 54934725612.

It is not a de Polignac number, because 21652743945 - 2⁸ = 21652743689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21652743894 and 21652743903.

It is not an unprimeable number, because it can be changed into a prime (21652743949) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2580597 + ... + 2588973.

It is an arithmetic number, because the mean of its divisors is an integer number (627344640).

Almost surely, 2^21652743945 is an apocalyptic number.

It is an amenable number.

21652743945 is a deficient number, since it is larger than the sum of its proper divisors (18497313015).

21652743945 is a wasteful number, since it uses less digits than its factorization.

21652743945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8734.

The product of its digits is 1814400, while the sum is 48.

The spelling of 21652743945 in words is "twenty-one billion, six hundred fifty-two million, seven hundred forty-three thousand, nine hundred forty-five".